Method and apparatus for electrical discharge machining

Details Method and apparatus for electrical discharge machining Method and apparatus for electrical discharge machining

1973-12-19

1976-12-21

Reynolds, Bruce A.

Electric heating

Metal heating

Cutting or disintegrating

219 69C, 219 69P, B23P 108

Patent

active

039990281

ABSTRACT:
A method and apparatus for shaping a workpiece by electrical discharge, the workpiece being shaped by a shaping electrode by intermittently impressing a voltage pulse across a working gap formed between the workpiece and the shaping electrode. The apparatus comprises a means for efficiently controlling the duration of a discharge across the working gap according to a condition dependent upon a no-load voltage impressing period, i.e., the period of operation beginning with the impression of the voltage pulse and ending with the occurrence of a discharge, and further according to the state of the working gap detected in terms of a processing voltage mean value. When a no-load voltage impressing period is inside a given interval, the duration of a discharge is increased according to the length of the period. Alternatively, when the no-load voltage impressing period is outside the given interval, the duration of a discharge corresponding to the state of the working gap is not increased. Accordingly, operating stability is improved and electrode consumption is minimized.

REFERENCES:
patent: 3590317 (1971-06-01), Sennowitz
patent: 3614368 (1971-10-01), Lobun
patent: 3697719 (1972-10-01), Vernen
patent: 3705287 (1972-12-01), Saito et al.
patent: 3755645 (1973-08-01), Kauffman

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